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Map of the Riparian Republic

The Riparian Republic was the largest of the early successor states to the USA following the collapse caused by the Great Flood of 2050. The Postdeluvian Era saw a mass renaming of surviving cities (and the creation of not a few completely new ones. Curiously, the capital of the Riparian Republic, Springfield in what was formerly the State of Illinois, was one of the few cities to retain its antedeluvian name. Supposedly, the Riparian Republic's first President, Lisa Simpson had a hand in this.